1) Options: I don't like the language menu.
I suggest you to use a drop-down menu.
If you still want to show the flags, use a little icon instead of those BIG icons.
2) Options: I'd use the style, you used for the languages, for the file types.
You could add new items in the future, can't you?
3) Give your users the possibility to insert new folders to be deleted completely
4) Give your users the possibility to export the log of found items
5) Give your users the possibility to have a log file created automatically after they used the program (in the log folder of your program), or after the automatic mode did for them
6) Give your users the possibility to first move the files in the recycle bin